Abstract
The effect of Polyvinylchloride (PVC) on the polymerization of styrene (St) and of methyl methacrylate (MMA) was investigated. Rate of polymerization and molecular weights of polymers were measured. It was found that PVC behaved as a retarder against the polymerization of MMA. But PVC had no effect on the polymerization of St. The formation of graft interpolymer was convinced by the fractionation of the gross-polymer. Grafting efficiency was computed from the extracted quantity of free polystyrene or polymethyl methacrylate. It was found that with increase of the concentration of PVC, the grafting efficiency of St increased and that of MMA decreased. Chain transfer constants of St and MMA against PVC were measured. The polymerization of St in the presence of vinylidene chloride-vinyl chloride-copolymer was also investigated. Chain transfer constant and grafting efficiency were calculated.
